Wheeled scraper



Feb.3,1942. f '10, DAWSON 2,271,631f

WHEELED SCRAPER Filed Nov. s, 1959 Patented Feb. 3,'1'942 WHEELED SCRAPER Trevor 0. Davidson, Milwaukee, Wis., assignor to Bucyrus-Erie Company,

South Milwaukee,

Wis., a` corporation of Delaware Application November 3, 1939, Serial No. 302,686 4 Claims. (Cl. 37--126) My invention relates to new and useful improvements in wheeled scrapers, ,either of the type in which the bowl both lls and dumps at its front end or of the type in which the bowl fills at its front end and dumps at its rear end, or of any other type which (as in both of the forementioned) raises its front end for carrying.

In such scrapers the bowl is usually simply or multiply pivoted on the frame, and rotates about its pivot or pivots to assume three positions, namely: digging, carrying and dumping. But in my invention, although there may be such a pivot or pivots for use in rotating the bowl from carrying to either front or rear-dumping, neither this provision nor any specific dumping means is essential, my invention being directed to raising the bowl from digging to carrying. by tilting the frame by changing the length of the wheelbase, preferably by shortening it.

The chief object of my invention is thereby to provide a scraper in which the digging edge will move backwardly out of the material which is being dug, when passing from digging position to carrying position. If the bowl dumps forwardly about a pivot close to the digging edge, the digging edge can be used to spread the material during dumping.

In addition to my principal objects, above stated, I have worked out a number of novel and useful details, which will be readily evident as the description progresses.

My invention consists in the novel parts and in the combination and arrangement thereof, which are dened in the appended claims, and of which one embodiment is exemplified in the accompanying drawing, which are hereinafter particularly described and explained.

Throughout the description, the same reference number is applied to the same men er or to similar members.

Figure 1 is a my scraper.

Figure 2 is a side elevation of said embodiment of my scraper, in digging position.

Figure 3 is a side elevation oi said embodiment of my scraper, in carrying position. n

Referring now to the figures, we see that Il 1s the main frame of my scraper, supported on a rear ground-support, here shown as consisting of an axle i2 and two wheels I3, but which may plan view of one embodiment of be of any other conventional form. n

My digging bowl I4 is hung from the mam l5, about which it can be rocyllnders i6, or any In fact, a digging 55 frame Il at pivot tated by means of hydraulic other conventional means.

bowl of any other type,l dumped in any other manner, and provided or not with an apron (not shown) as for example in UnitedStates Patent No. 2,106,759 to T. R. Paulsen, would equallyv well constitute the digging-bowl element of my invention.

The main frame Il is supported at the front on aground-support consisting of an axle Il and wheels I8. .This axle is connected to the frame I I by means of a universal joint I9 and arms 20. By virtue of the universal joint, which may be of any conventional form and hence is not shown in detail, the front support can swivel so as to follow the towing tractor.

Pivoted on the frame il is a cylinder 2|, the piston 22 of which is attached to the axle I1 through the universal joint I9.

The axle I1 carries a ring.23, for its attachment to a tractor 24 by means of a drawbar 25,

or the equivalent.

My invention operates as follows: When the piston 22 is retracted, as shown in Figure 2, the bowl I4 is in digging contact with the ground. The depth of cut can be regulated by the degree of retraction of piston 22.

To raise the bowl to carrying position, piston 22 is extended as shown in Figure 3.

Comparing Figures 2 and 3, it will be seen that the tractor 24 is shown in the same place in both gures, and that the raising of the bowl I4 has resulted in backing it away from the cut. It will be evident that, if piston 22 be extended rapidly enough with respect to the speed of travel of tractor 24, the digging edge of the bowl I4 will back out of the cut even while the tractor continues to advance. This feature is one of the chief advantages of my invention. Any other equivalent means might be used to rotate arms 20.

To dump my bowl I4, the pistons of cylinders i6 are extended, but the specic means of dumping forms no part of my invention. In the claims, the separate recital of dumping means is not intended to imply that the dumping means is separate from any other recited means.

Having now described and illustrated one form of my invention, I wish it to be understood that my invention is not to be limited to the specific form or arrangement of parts hereinbefore described, except insofar as such limitations are specified in the appended claims. For example, the extensibility could be effected by sluiting the rear supports.

I claim:`

l. In a scraper, the combination of: a frame,

front and rear ground supports for said frame; an arm extending forwardly and upwardly from the front support to a transvrse pivot on the frame; a digging bowl supported by the frame; means to rotate this arm forwardly about its said pivot, thereby raising the front end of the frame, and thereby raising the front end oi.' the bowl from digging to carrying position; and means for dumping the bowl.

2. A scraper, according to claim 1, characterized by having a draught connection attached to the front support. Y

3. A scraper, according to claim 1, characterized by the fact that the means to rotate the arm consists of a forcibly extensible element extend- 15 ing from the frame to the front support, and by the fact that the arm and the forcibly extensible element are both connected to the front support through a swivel to enable the front support to turn for steering.

4. A scraper, according to claim 1, characterized by the fact that the means to rotate the arm consists of a cylinder and piston assembly extending from the frame to the front support, and by the fact that the arm and the cylinder and piston assembly are both connected to the front support through a swivel to enable the front support to turn for steering.

TREVOR O. DAVIDSON. 

